Light will NOT pass through a pair of Polaroids when their axes are
A) 45 degrees to each other.
B) parallel.
C) perpendicular.
D) all of the above
E) none of the above
Answer: C
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Which statement about stellar motion is incorrect?
A) In general, the closer a star is, the more its proper motion. B) The radial velocity is measured by the Doppler shift. C) The transverse velocity is measured by the proper motion and the distance. D) Like parallax, proper motion is measured over intervals of exactly six months. E) The Pythagorean theorem relates space, transverse, and radial velocities.
If a star has an extrasolar planet, the shape of its radial velocity curve is related to the planet's
A) orbital eccentricity B) mass C) radius D) orbital period
What practical value did astronomy offer to ancient civilizations?
A) It helped them keep track of time and seasons, and it was used by some cultures for navigation. B) It allowed them to predict eclipses with great accuracy. C) It helped them understand our cosmic origins. D) It helped them find uses for ancient structures like Stonehenge.
Meanders
A) migrate downstream. B) shorten the stream. C) migrate upstream. D) remain in one place.